Kurumun Atıf Alan Makalesi
Atıf Alan Yayın
Linear and nonlinear intersubband optical absorptions in an asymmetric rectangular quantum well
Scopus
Toplam 232 atıf DOI
The linear and nonlinear intersubband optical absorptions in Al xlGa 1-xlAs/GaAs/Al xr Ga 1-xrAs asymmetric rectangular quantum well are studied within the framework of the density matrix formalism. We have calculated the electron energy levels and the envelope wave functions using the effective mass approach. In addition, we have obtained an expression for saturation intensity. It is shown that the parameters such as asymmetry and width of potential well not only shift the peak positions in absorption spectrum but also considerably modify their height. These results suggest that the absorption process can be easily controlled by the structure parameters of an asymmetric rectangular quantum well. Also, the incident optical intensity has a great effect on the total absorption spectrum. We have seen that the absorption peak is reduced by half when the optical intensity is approximately 0.8 MW/cm 2 for well width L=90 Å and β=0.5. Moreover, it is seen that the saturation intensity is quite sensitive to the structure parameters of an asymmetric rectangular quantum well. Thus, the results presented here can be useful for electro-optical modulators and photodetectors in the infrared region. © EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007.
Atıf Kaynağı
Atıf Yapan Yayın
Nonlinear optical rectification and optical absorption in GaAsGa 1xAlxAs asymmetric double quantum wells: Combined effects of applied electric and magnetic fields and hydrostatic pressure
Scopus
Havuzumuzda 132 atıf almış
The intersubband electron-related nonlinear optical absorption and nonlinear optical rectification in GaAsGa1xAlxAs asymmetric double quantum wells are studied, under the influence of combined or independent applied electric and magnetic fields as well as hydrostatic pressure. The outcome of the density matrix formalism and the effective mass, and parabolic-band approximations have been considered as main theoretical tools for the description. It is obtained that under particular geometrical conditions, with or without electric and/or magnetic field strength, the optical rectification is null and, simultaneously, in such circumstances the optical absorption has a relative maximum. It is also detected that the influence of the hydrostatic pressure leads to increasing or decreasing behaviors of the nonlinear optical absorption in dependence of the particular regime of pressure values considered, with significant distinction of the cases of opposite electric field orientations. © 2011 Elsevier B.V. All rights reserved.
Atıf Yapan Makale Bilgileri
Kurumlar (3)
Selçuk Üniversitesi
Selçuklu, Turkey
Universidad Autónoma del Estado de Morelos
Cuernavaca, Mexico
Universidad de Antioquia
Medellin, Colombia